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RFI - Attachment F - Engineering Report
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Seasonal variation of Suspended Solids
70% 250
% Suspended
Rainfall
Rainfall (m m)
60% 200
Urban
Solids
150
50%
100 Comm
40% 50 Base
30% 0
ne
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Months
Figure 11: Season Variation of Suspended Solids
No Seasonal Varation Of Bed Load
50% 250
40% 200 Rainfall
% Bed Load
Rainfall (mm)
30% 150 Urban
20% 100 Comm
10% 50 Base
0% 0
ne
ril
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Month
Figure 12: No Seasonal variation of Bed Load
This seasonal variation in suspended solids size particles and gross pollutants has
management implications. For example if mechanical street sweeping is performed to
lower suspended solids levels, this should be carried out more in less windy months,
alternatively if manual street sweeping is being performed to reduce gross pollutants this
should be done more frequently in windy months
18
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